Uni-ball Signo 207 Refills, Black Ink, 0.5 Mm Micro Point, 6 Packs of Refills with One Free Pen This bundle includes six packs of UniBall Signo 207 Black gel ink 0.5 mm refills (12 Refills Total) along with a UniBall pen and a Plexon rollerball Pen Uni Super ink is specially formulated to become trapped in paper, helping prevent criminal check washing and other document alteration.